Four microreactors reach criticality as Commerce eases Nvidia H200 approvals for Chinese AI labs

DOE records confirm Oklo Aurora, NuScale VOYGR, X-energy Xe-100 and Ultra Safe Nuclear MMR each sustained chain reactions on or before the 250th anniversary target. The milestone followed 18 months of accelerated licensing under revised 10 CFR Part 53 rules. Parallel BIS notices lifted prior holds on H200 exports to three designated Chinese entities after they submitted revised end-use certificates. Total permitted volume remains capped at 2,000 units per firm through 2027.

AI training clusters already consume 1.5 GW in the United States and are projected to require 8 GW by 2028 according to Lawrence Berkeley National Lab estimates. China’s approved H200 deployments target 800 MW of new capacity in Inner Mongolia and Xinjiang, where coal plants currently supply 70 percent of data-center load. Nuclear restart timelines therefore directly constrain both nations’ ability to scale frontier models without carbon penalties.

Operational impact appears in procurement: hyperscalers now sign 20-year PPAs with microreactor developers at $70–90/MWh, while Chinese labs face 18-month queues for H200 allocation. Grid interconnection studies show the four critical reactors could add 320 MW firm capacity by 2029 if fuel fabrication and transmission upgrades stay on schedule.

Next steps hinge on NRC fuel qualification tests and BIS compliance audits scheduled for Q1 2027. Failure rates above 15 percent in either process would delay both US grid deliveries and Chinese training runs by at least nine months.